For one thing, Google in app payments via carrier billing are not available yet. When it will be, I would not bet too many of the world's ~200 countries will be

For one thing, Google in app payments via carrier billing are not available yet. When it will be, I would not bet too many of the world's ~200 countries will be supported, just a few key markets. Same with Android Market itself, it works in just a tiny mnumber of countries: http://market.android.com/support/bin/answer.py?answer=138294&hl=en http://market.android.com/support/bin/answer.py?answer=13829... Compare that to mobile payment operators, who's key job is to work on carrier agreements across the world. That's why the likes of Rovio choose companies like Fortumo: http://www.socialtimes.com/2010/06/fortumo-launches-international-in-app-payments-for-android/ http://www.socialtimes.com/2010/06/fortumo-launches-internat...